Mode localization analysis of mistuned bladed disk coupled by interstage contact
Wang Ai-lun1,2; Chen Jin-bo1,2
1.Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing (Central South University), Changsha 410083, China; 2. College of Mechanical and Electrical Engineering, Changsha 410083, China
Abstract:The finite element model of two-stage bladed disks in gas turbine rotor was established. The modal characteristics of multistage and single bladed disk were compared. The effect of interstage contact coupling on frequency veering characteristic of bladed disk was focused on. The results show that new modes of stage-coupled vibration appear due to interstage contact coupling. The frequency veering characteristic is modified that modes near frequency veering region are less dense, such modification leads to a low sensitivity to mistuning for bladed disk. The modal characteristic of mistuned two-stage bladed disks was analyzed. It is verified that mode localization degree of mistuned bladed disk is reduced greatly.